Hub-bell For Driven Tail Rotor

Provided that you maintain your model helicopter conscientiously and set it up according to the instructions, the model’s flying load limits are well outside its normal flight envelope.
Detail features of the kit are designed to suit normal applications, but different parts can be retro-fitted at any time, e.g. if you wish to convert a Kobold into a mechanical system for a full-fuselage model. To extend the load limits further you can use this freewheel and/or this hub (if you want a driven tail rotor for auto-rotation). However, both must only be used in conjunction with the pinion shaft 41/25. The outside diameter is 59 mm in both cases.
Hub, reinforced, for driven tail rotor, with internal-tooth gear